Here's a stats and skill build for the Thief job class in the MMORPG - Ragnarok Online: Valkyrie Uprising. This build will focus on using Daggers as the main weapon, and exclusive skills that will reinforce the weapon.

Dagger Thief Sins can go for DPS builds, Dodger builds, Hybrid builds for better survivability, and even Tank builds! Refer below to learn more about the builds.

- Thief/Assassin Dagger Stats Build -

Understanding Ratios:
- Example: 3 STR : 2 VIT means for every 3 STR, you should aim for 2 VIT.
Example: If you have 60 STR, you should aim for 40 VIT, or if you have 20 VIT, you should aim for 30 STR.

- Note that Ratios doesn't need to be exact always. Allocate the way you want it.
Example: Go for 30 STR first then go for 20 VIT next, so in the end, you still have 3 STR : 2 VIT ratio.

Stats Allocation: Target Ratios and BuildsNote: Builds are based from Skills, and Stats from equips/items that you will get later.
Choose what you think is best for your playing style, time and in-game money.

- Example [STR and VIT] Builds: - [6 STR : 4 VIT] or [7 STR : 3 VIT] Stats Ratio
- Great damage output and survivability but has low base Attack Speed. 2nd most
common builds so far.
- Relies on skills and equipments for more Attack Speed.
- If you are comfortable with your HP pool's damage intake (around 30~50 VIT) ,
you can stop putting more VIT and invest all points to STR. Resume ratio at higher levels if needed.

- Pure STR Stats Ratio
- A glass cannon build that mainly focuses on high attacks and critical rates. Relies
more heavily on equipments to compensate the lack of survivability and for more Attack Speed.

- Pure AGI Stats Ratio
- Pure Dodger build for players that mainly wants to focus on Flee and ASPD stats.
- Somewhat hard to level up due to low damage output, but it can be compensated
with heavily upgraded high attack Daggers and items with decent Critical Rates and ASPD.
- Can also lure tank due to high Dodge (around 70%+ Flee with Stats/Skill/Cards
and more). Note that 10 AGI = 1 Flee.
- You can also add some STR, VIT, or STR-VIT if you like.

- Pure VIT Stats Ratio
- Interesting tank build that utilizes VIT's Health and damage reduction with good
Dodge Rate!. If you are looking for other tank class to play, try this build.
- Dominates early game, has great survivability but has lower damage output. Highly
dependent to "Party Plays" to boost up level.
- Stats to Focus on: FLEE, MaxHP, DEF, MDEF, and VIT (ignore stats listed
below). Aim for 70+ Flee from Equips and Cards, add some AGI stats if you want.
- Recommended Skills (ignore skill set below): Increased Dodge Lvl 10 and
Envenom Lvl 10. You may also equip any Katar to your quick slot as you alternate weapon, to use Deadly Crossing Lvl 5 and/or Meteor Assault Lvl 10 for debuffs!

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- Thief/Assassin Dagger Skill Build -

Base Skills to Get: (In Order)
- Double Attack Lvl 8 = Your main Attack skill and to unlock Leg Slash. Note that
as you increase this skill, it's cool down will also decrease, which makes it a very good spammable skill!
- Leg Slash Lvl 5 = Your combo skill, always use this 0 SP skill right after using
Double Attack. If your target has been killed by your Double Attack skill, you can quickly target another one to use this skill.
- Dagger Mastery Lvl 10 = To increase your Dagger's damage and ASPD!
- Double Attack Lvl 10 = Max it.

- Increased Dodge Lvl 10 = Increases Flee or Dodge Rate to up to 30%. Get this
first, before Blade of Sea if you need more survivability or if you are using a Pure AGI or VIT build. Some Sins will get this later because of their high ASPD and HP Absorb % weapons.
- Blade of Sea Lvl 10 = Increases Critical Hit Rate to up to 12%. Paired with your
ASPD, this is actually helpful. Get this first, before Increased Dodge if you need more fire power.

- Total = 45

More Skills
- Envenom = At Lvl 10, Envenom can deal a one hit 400% damage with a 50%
chance to inflict poison to target dealing 200 damage per second for 11 seconds. Get this skill instead of Enhanced Double Attack and Blade of Sea above if you are using a Pure VIT build or if you need more damaging skill.
- Enhanced Double Attack = Raises Double Attack's damage to up to 32%.

Optional Skills
- Cloaking Lvl 1 = Can be used as an escape mechanism.

*Notes
- If you reached the Cap for Job Level!, the rest is up to your personal
preference now, you have the base skills that you needed most anyway.
- If you want to reset your skills, use the "Flash Stick" item (free after job change,
get from Daily Spins or Buy in the Cash Shop)._________________________________________________________________

- Stats to Get from Equips, Cards and Pets -

Damage Output!
- (STR + or ATK +) Attack Damage = The more, the better.
- (Aspd +) Attack Speed = Aim for around 150~200, or more if you want.
- (AGI +) = Just get what you can.
- (Critical +) Critical % Rate = The more, the better.